Abstract
Controlled differentiation of embryonic stem (ES) cells into clinically relevant cell types is a fundamental goal of stem cell research. This unit describes one of the most efficient protocols for conversion of mouse ES cells into a defined type of nerve cells, the spinal motor neurons. ES cells are separated from feeder mouse embryonic fibroblasts and aggregated to form embryoid bodies (EBs). Two days after the withdrawal of growth factors, EBs reach a stage at which they are responsive to patterning signals and can be effectively induced with retinoic acid (RA) to differentiate into spinal nerve cells. Nascent neural cells become responsive to the ventralizing signal sonic hedgehog (Hh) that controls expression of ventral spinal progenitor markers and initiates the genetic program of motor neuron differentiation.
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